1538-A Strobotac Electronic Stroboscope
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♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT ♦ 1538-A Strobotac Electronic Stroboscope User and Service Manual Copyright © 2001 IET Labs, Inc. 1538-A im/March, 2002 IET LABS, INC. Standards • Decades • Strobes • Sound Level Meters • Bridges Formerly manufactured by 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988 GenRad www.ietlabs.com WARRANTY We warrant that this product is free from defects in material and workmanship and, when properly used, will perform in accordance with applicable IET specifications. If within one year after original shipment, it is found not to meet this standard, it will be repaired or, at the option of IET, replaced at no charge when returned to IET. Changes in this product not approved by IET or application of voltages or currents greater than those allowed by the specifications shall void this warranty. IET shall not be liable for any indirect, special, or consequential damages, even if notice has been given to the possibility of such damages. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUD- ING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTIBILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. WARNING OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. Dangerous voltages may be present inside this instrument. Do not open the case Refer servicing to qulified personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES (> 45 V) ARE USED, TAKE ALL MEASURES TO AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS. USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE CONDUCTORS WHEN USING THIS INSTRUMENT. Use extreme caution when working with bare conductors or bus bars. WHEN WORKING WITH HIGH VOLTAGES, POST WARNING SIGNS AND KEEP UNREQUIRED PERSONNEL SAFELY AWAY. CAUTION DO NOT APPLY ANY VOLTAGES OR CURRENTS TO THE TERMINALS OF THIS INSTRUMENT IN EXCESS OF THE MAXIMUM LIMITS INDICATED ON THE FRONT PANEL OR THE OPERATING GUIDE LABEL. Contents Section 1 INTRODUCTION ..................................................................................................................................... 1 1. General Description of a Stroboscope ...................................................................................................... 1 1.1. What it is ........................................................................................................................................ 1 1.2 How it works................................................................................................................................... 1 1.3 The Type 1538 Strobotac® Electronic Stroboscope ....................................................................... 2 1.3.1 General Description ............................................................................................................... 2 1.3.2 Controls and Connectors ........................................................................................................ 2 1.3.3 Accessories Supplied ............................................................................................................. 4 1.3.4 Accessories Available ............................................................................................................ 4 Section 2 OPERATING PROCEDURE ................................................................................................................... 6 2.1 Opening the Case ............................................................................................................................ 6 2.2 Closing the Case ............................................................................................................................. 6 2.3 Power Requirements....................................................................................................................... 6 2.3.1 Power-Line Operation ........................................................................................................... 6 2.3.2 Battery Operation .................................................................................................................. 7 2.3.3 Type 1538-P3 A Battery Source and Charger ....................................................................... 7 2.4 Turning the Instrument On .............................................................................................................. 8 2.5 Positioning the Stroboscope ............................................................................................................ 8 2.6 Adjusting the Flashing Rate ............................................................................................................. 8 2.7 Calibration ....................................................................................................................................... 8 2.8 Speed Measurements ...................................................................................................................... 9 2.8.1 Fundamental-Speed Measurement ........................................................................................ 9 2.8.2 Submultiple Speed Measurements ....................................................................................... 10 2.8.3 Measurement of Speeds above 150,000 RPM .................................................................... 10 2.8.4 Low-Speed Operation .......................................................................................................... 11 2.8.5 Slow-Motion Studies ............................................................................................................ 11 2.9 Type 1538-P2 Extension Lamp ..................................................................................................... 11 2.10 External Synchronization ............................................................................................................. 12 2.10.1 Use of the Input Jack ......................................................................................................... 12 2.10.2 Type 1531-P2 Flash Delay and type 1536 Photoelectric Pick-off ..................................... 12 2.10.3 Type 1537 Photoelectric Pick-off ...................................................................................... 13 2.10.4 Type 1539 Stroboslave ....................................................................................................... 13 2.10.5 Use of Multiples Stroboscopes........................................................................................... 13 2.10.6 Connecting the Accessory Instruments ............................................................................. 13 2.11 High-Speed Photography ............................................................................................................. 14 2.11.1 General ............................................................................................................................... 14 2.11.2 Flash Duration .................................................................................................................... 14 2.11.3 Beam .................................................................................................................................. 14 2.11.4 Spectral Characteristics ..................................................................................................... 14 2.11.5 Exposure Data .................................................................................................................... 15 2.11.6 Single-Flash Photography ................................................................................................... 15 2.11.7 Type 1538-P4 High-Intensity-Flash Capacitor ................................................................... 15 Section 3 PRINCIPLES OF OPERATION ...........................................................................................................17 3.1 General .......................................................................................................................................... 17 3.2 The Strobotron Tube ..................................................................................................................... 17 3.3 The Charging Circuit ..................................................................................................................... 17 3.4 The Calibration Circuit .................................................................................................................. 19 Section 4 SERVICE AND MAINTENANCE ........................................................................................................20 4.1 Customer Service .......................................................................................................................... 20 4.2 Instrument Return ......................................................................................................................... 20 4.3 Minimum Performance Standards ................................................................................................ 20 4.3.1 General ................................................................................................................................. 20 4.3.2 Equipment Required ............................................................................................................. 20 4.3.3 Preliminary Check................................................................................................................ 20 4.3.4 Flashing-Rate